The general rule is nothing made with flour or wheat (bread, pasta, cereal, pastries etc), no sugar, no dairy, and nothing cooked or fried if you can help it...especially starches like potato.
If you are serious, don’t eat any solid food during a cleans because it slows down the elimination flow. The best scenario is starting with a short water fast, then nothing but green juices for a while, then green smoothies, then raw food. Read the book “Heal Yourself 101” for the details.